Friar Giovanni DiPlano Carpini
Genghis Khan divided his Tartars by captains of ten, captains of a hundred, and captains of a thousand, and over ten millenaries, or captains of a thousand, he placed one colonel, and over one whole army he authorized two or three chiefs, but so that all should be under one of the said chiefs. When they join battle against any other nation, unless they do all consent to retreat, every man who deserts is put to death. And if one or two, or more, often proceed manfully to the battle, but the residue of those ten draw back and follow not the company, they are in like manner slain. Also, if one among ten or more be taken, their fellows, if they fail to rescue them, are punished with death.
Moreover they are required to have these weapons: two long bows or one good one at least, three quivers full of arrows, and one axe, and ropes to draw engines of war. But the richer have single-edged swords, with sharp points, and somewhat crooked. They have also armed horses, with their shoulders and breasts protected; they have helmets and coats of mail. Some of them have jackets for their horses, made of leather artificially doubled or trebled, shaped upon their bodies. The upper part of their helmet is of iron or steel, but that part which circles about the neck and the throat is of leather. Some of them have all their armour of iron made in the following manner: they beat out many thin plates a finger broad, and a hand long, and making in every one of them eight little holes, they lace through three strong and straight leather thongs. So they join the plates one to another, as it were, ascending by degrees. Then they tie the plates to the thongs, with other small and slender thongs, drawn through the holes, and in the upper part, on each side, they fasten one small doubled thong, that the plates may firmly be knit together. These they make, as well for their horses as for the armour of their men; and they scour them so bright that a man may behold his face in them. Some of them upon the neck of their lance have a hook, with which they attempt to pull men out of their saddles. The heads of their arrows are exceedingly sharp, cutting both ways like a two-edged sword, and they always carry a file in their quivers to sharpen their arrowheads.
They are most efficient in wars, having been in conflict with other nations for the space of these forty-two years. When they come to any rivers, the chief men of the company have a round and light piece of leather. They put a rope through the many loops on the edge of this, draw it together like a purse, and so bring it into the round form of a ball, which leather they fill with their garments and other necessaries, trussing it up most strongly. But upon the midst of the upper part thereof, they lay their saddles and other hard things; there also do the men themselves sit. This, their boat, they tie to a horse's tail, causing a man to swim before, to guide over the horse, or sometimes they have two oars to row themselves over. The first horse, therefore, being driven into the water, all the others' horses of the company follow him, and so they pass through the river. But the common soldiers have each his leather bag or satchel well sewn together, wherein he packs up all his trinkets, and strongly trussing it up hangs it at his horse's tail, and so he crosses the river.
Source: John de Plano Carpini, The long and wonderful voyage of Frier lohn de Plano Carpini, Http://etext. library. adelaide. edu. aU/h/hakluyt/voyages/carpini/ complete. html